<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8" />
<title>Hello React!</title>
<script src="https://cdn.staticfile.org/react/16.4.0/umd/react.development.js"></script>
<script src="https://cdn.staticfile.org/react-dom/16.4.0/umd/react-dom.development.js"></script>
<script src="https://cdn.staticfile.org/babel-standalone/6.26.0/babel.min.js"></script>
</head>
<body>

<div id="example"></div>
<script type="text/babel">
/* 继承 Component 组件类，重写 render 方法*/
class Clock extends React.Component{
	render(){
		return (
			<div>
				<h1>电子时钟</h1>
				<h2>当前时间为：{this.props.date.toLocaleTimeString()}.</h2>
			</div>
		);
	}
	
}

function tick() {
  ReactDOM.render(
    <Clock date={new Date()} />,
    document.getElementById('example')
  );
}

setInterval(tick, 1000);
</script>

</body>
</html>